diff options
| -rw-r--r-- | fs/isofs/compress.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c index 9bb2fe35799d3..10205ececc274 100644 --- a/fs/isofs/compress.c +++ b/fs/isofs/compress.c @@ -20,6 +20,7 @@ #include <linux/init.h> #include <linux/bio.h> +#include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/zlib.h> @@ -59,7 +60,7 @@ static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start, >> bufshift; int haveblocks; blkcnt_t blocknum; - struct buffer_head *bhs[needblocks + 1]; + struct buffer_head **bhs; int curbh, curpage; if (block_size > deflateBound(1UL << zisofs_block_shift)) { @@ -80,7 +81,11 @@ static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start, /* Because zlib is not thread-safe, do all the I/O at the top. */ blocknum = block_start >> bufshift; - memset(bhs, 0, (needblocks + 1) * sizeof(struct buffer_head *)); + bhs = kcalloc(needblocks + 1, sizeof(*bhs), GFP_KERNEL); + if (!bhs) { + *errp = -ENOMEM; + return 0; + } haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks); ll_rw_block(REQ_OP_READ, 0, haveblocks, bhs); @@ -190,6 +195,7 @@ z_eio: b_eio: for (i = 0; i < haveblocks; i++) brelse(bhs[i]); + kfree(bhs); return stream.total_out; } @@ -305,7 +311,7 @@ static int zisofs_readpage(struct file *file, struct page *page) unsigned int zisofs_pages_per_cblock = PAGE_SHIFT <= zisofs_block_shift ? (1 << (zisofs_block_shift - PAGE_SHIFT)) : 0; - struct page *pages[max_t(unsigned, zisofs_pages_per_cblock, 1)]; + struct page **pages; pgoff_t index = page->index, end_index; end_index = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT; @@ -330,6 +336,12 @@ static int zisofs_readpage(struct file *file, struct page *page) full_page = 0; pcount = 1; } + pages = kcalloc(max_t(unsigned int, zisofs_pages_per_cblock, 1), + sizeof(*pages), GFP_KERNEL); + if (!pages) { + unlock_page(page); + return -ENOMEM; + } pages[full_page] = page; for (i = 0; i < pcount; i++, index++) { @@ -357,6 +369,7 @@ static int zisofs_readpage(struct file *file, struct page *page) } /* At this point, err contains 0 or -EIO depending on the "critical" page */ + kfree(pages); return err; } |